Experimental Characterization of Stall Noise Toward its Modelling

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Abstract

Wind tunnel measurements of three different airfoils are investigated using surface pressure microphones flush-mounted on the suction side of the airfoils. In stalled conditions, these microphones can be used to evaluate the convection velocity and the correlation length of the turbulent vortices that are generated in the separated region of the stalled flow. In addition, stall is characterized by the appearance of a spectral hump at relatively low frequencies that can be measured by the microphones located in the separated region. Using appropriate normalization and scaling, a nearly universal model that can represent the behavior of the surface pressure spectra in this low frequency range is devised.
Original languageEnglish
Title of host publicationProceedings of the 6th International Conference on Wind Turbine Noise
Number of pages12
Publication date2015
Publication statusPublished - 2015
Event6th International Conference on Wind Turbine Noise - Glasgow, United Kingdom
Duration: 20 Apr 201523 Apr 2015
Conference number: 6

Conference

Conference6th International Conference on Wind Turbine Noise
Number6
CountryUnited Kingdom
CityGlasgow
Period20/04/201523/04/2015

Cite this

Bertagnolio, F., Aagaard Madsen , H., Fischer, A., & Bak, C. (2015). Experimental Characterization of Stall Noise Toward its Modelling. In Proceedings of the 6th International Conference on Wind Turbine Noise